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Codepoint, buffer code, and file code.

From: Hongyi Zhao
Subject: Codepoint, buffer code, and file code.
Date: Thu, 8 Jul 2021 08:27:30 +0800

See the following information given below by describe-char:
         position: 214 of 262 (81%), column: 12
            character: ∞ (displayed as ∞) (codepoint 8734, #o21036, #x221e)
              charset: unicode (Unicode (ISO10646))
code point in charset: 0x221E
               script: symbol
               syntax: _     which means: symbol
             category: .:Base, c:Chinese, h:Korean, j:Japanese
             to input: type "C-x 8 RET 221e" or "C-x 8 RET INFINITY"
          buffer code: #xE2 #x88 #x9E
            file code: #xE2 #x88 #x9E (encoded by coding system utf-8-unix)
              display: by this font (glyph code)
    ftcrhb:-PfEd-DejaVuSansMono Nerd Font
Mono-normal-normal-normal-*-20-*-*-*-m-0-iso10646-1 (#x838)

Character code properties: customize what to show
  name: INFINITY
  general-category: Sm (Symbol, Math)
  decomposition: (8734) ('∞')

There is an overlay here:
 From 213 to 215
  before-string        [Show]
  category             flycheck-warning-overlay
  flycheck-error       [Show]
  flycheck-error-index 39
  flycheck-overlay     t
  help-echo            flycheck-help-echo
  line-prefix          [Show]

There are text properties here:
  fontified            nil
  wrap-prefix          " "


What difference does code point, buffer code, and file code mean, and
what's the relationship among them?

Assoc. Prof. Hongyi Zhao <>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
NO. 552 North Gangtie Road, Xingtai, China

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