noun
significant SGML character
Technical computing term referring to characters with special meaning in SGML parsing, such as '<', '>', and '&'. Rare outside markup language documentation.
SGMLでは、重要なＳＧＭＬ文字を実体参照で表す必要がある。
In SGML, significant SGML characters must be represented using entity references.
A compound of 重要な (important) + ＳＧＭＬ (SGML) + 文字 (character), directly calqued from the English computing term 'significant SGML character'.