Numeric Annotation Glyphs

Numeric Annotation Glyphs or NAGs are used to annotate chess games when using a computer, typically providing an assessment of a chess move or a chess position.wikipedia
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Portable Game Notation

PGNPGN format
NAGs were first formally documented in 1994 by Steven J. Edwards in his Portable Game Notation Specification and Implementation Guide.
He or she may also comment on the game by inserting Numeric Annotation Glyphs (NAGs) into the movetext.

Chess annotation symbols

?!chess punctuation
* Chess annotation symbols
Numeric Annotation Glyphs

Chess Informant

Šahovski Informator
The meanings first defined stemmed from the use of specific typographic symbols when annotators were commenting upon chess games; most especially in Chess Informant publications.