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Hex C2A0 is UTF8 for non-breaking space

ISO 8859-1 encodes what it refers to as “Latin alphabet no. 1”, consisting of 191 characters from the Latin script. Hence, also called Latin-1

With the gucharmap program a lot of characters can be shown with their UTF code
This program is not user friendly:

• It shows characters which are not on the system. There is no option to filter these out
• The list is of fonts is not sorted, nor classified
• There is no search function

Add to /home/user/.xinitrc

setxkbmap -option compose:lwin

Add to /home/user/.xsession

source ~/.xinitrc &
wmpid=$!
xfce4-session
wait $wmpid

wait might be replaced with waitpid for more readability (not tested)
Log out of Xwindows and log in again
Now the compose key is the left windows key
To use it, press it, release it and then enter the desired key sequence. For example

e
=

which gives the € sign. Or do

compose key 
1
2

for the ½ sign

e= → €
l- → £
e" → ë "e → ë
!e → ẹ
^o → ô
/o → ø
!? → ‽
ss → ß
^2 → ²
^3 → ³
oo → °
xx → ×
.. → …
--- → —
// → \
>> → »
<- → ← 
-> → →
=/ → ≠
|c → ¢
12 → ½

symbol2unicode Generate unicode symbols from similar ascii character combinations

UTF-8 is backward compatible with ASCII. It uses a specific structure to differentiate between one-byte (ASCII) characters and multi-byte characters.

• Single-byte Characters (ASCII)
  • In UTF-8, the first 128 characters (0 to 127) are identical to ASCII
  • A single-byte UTF-8 character has its most significant bit (MSB) set to 0. Any byte with a value from '0x00' to '0x7F' represents an ASCII character
  • Example: ASCII 'A' (decimal 65) is in UTF-8 '0x41' which is in decimal 65 and '01000001' in binary
• Multi-byte Characters
  • UTF-8 uses a variable-length encoding scheme. Characters beyond the ASCII range are represented using two, three, or four bytes
  • The first byte of a multi-byte character has its MSB set to 1
  • The number of leading 1 bits in the first byte indicates how many bytes are used for that character
  • Encoding Structure
    • 1-byte (ASCII): '0xxxxxxx' (0-127)
    • 2-byte: '110xxxxx 10xxxxxx'
    • 3-byte: '1110xxxx 10xxxxxx 10xxxxxx'
    • 4-byte: '11110xxx 10xxxxxx 10xxxxxx 10xxxxxx'

Use CTRL-Shift-u Uni-code-character-hex-code

Use the uni-code character hex code
You might do CTRL-Shift-u and then release the keys an enter the code like 3bb or it might be needed to press and hold CTRL-Shift press 'u', enter the code like 3bb and then release the CTRL-Shift keys

Example:

CTRL-Shift-u 3bb -> λ

The leading zero's can be omitted
Do not use the SHIFT key

⃤ U20E4 ➊ U278A  UE454 ⧗ U29D7 ⨂ U2A02 ⬛ U2B1B ⬤ U2B24 ⮚ U2B9A  UE021  UE02A  UE407 🕿 U1F57F 🖂 U1F582 🙼 U1F67C 🚘 U1F698  UE425  UE43F  UE033 ▇ U2587 ⏰ U23F0 🁻 U1F07B 🂱 1F0B1

HTML characters can be used in documents via copy and paste. For example arrows. The method:

• Select a character on the arrows page
• Enter the code in W3schools try it page (replace the Euro € code)
• Click on the 'Run' button
• Copy the character on the right side
• Past the character in the document

unicode.org
Alt-Codes, square signs and more Compose key cheat sheet
How add more
Entering special characters in Vim
Symbol > unicode
Test for Unicode support in Web browsers (very much characters)
Linux keyboard text symbols: Compose key shortcuts
Compose key
ComposeKeys
XCOMM UTF-8 (Unicode) compose sequence
UTF-8 and Unicode FAQ for Unix/Linux
ComposeKey - Ubuntu documentation

/home/user/.Xmodmap

Example

keycode  26 = e E eacute Eacute EuroSign cent EuroSign

To get an idea how to change keybindings see: xmodmap nl
xbindkeys
The XMacro package contains two simple, C++ programs (xmacrorec and xmacroplay) for recording and replaying keyboard and mouse events on an X server

Add to /etc/default/keyboard (not tested) in stead of to .initrc / .xsessions

XKBOPTIONS="compose:lwin"

Using the caps key as compose key

setxkbmap -option compose:caps

keysym 0xffe9, Alt_L
keysym 0xffea, Alt_R

/home/user/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml

When one program needs an other coding for its input use something like

cat file.txt | iconv -c --from-code=ISO-8859-1 --to-code=UTF-8

-c Silently discard characters that cannot be converted instead of terminating when encountering such characters

The xfce4-terminal 0.8.7.4 program is set to 'Default (UTF-8)' (see via Edit > Advanced tab > Encoding > Default character encoding)
When you get something like file�<80><99>s in a terminal try (rsync is an example):

• Set the locale as in this example of a locale file (change what is needed for your local needs)
• Run update-locale
• man rsycnc

(man rsync is an example)
If it does not resolve the issue try

LC_CTYPE=UTF-8; man rsync

Then we got this warning

bash: warning: setlocale: LC_CTYPE: cannot change locale (UTF-8): No such file or directory
man: can't set the locale; make sure $LC_* and $LANG are correct

However in the output of man rsync all characters looked fine
If not, close the man page en run the man rsync again

If this does not make the characters readable try LC_CTYPE=C to make all characters readable. Example

LC_CTYPE=C; man rsync

G: Graphic emoji
T: Text emoji

G	T	Explanation	Remark
😐	:-|	Neutral face
		Party time. An expression of happiness
		Releived
		You are welcome There is no specific emoji for this. A combination of 🙏 (folded hands) which is often used to express gratitude or a welcoming gesture, 😊 (smiling face with smiling eyes) which conveys friendliness and warmth and 🤗 (hugging face) which represents a warm welcome or embrace can be used
		Zum kotsen. An expression of great dissatisfaction and anger2)

unicode-6.0
List_of_emoticons

Hex editing
Archwiki xmodmap

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