IEC 60617-12 correspondingly contains the note (Section 2.1) "Although non-preferred, the use of other symbols recognized by official national standards, that is distinctive shapes in place of symbols , shall not be considered to be in contradiction with this standard.
IEC 60617-12則包含了相應的說明（在第2.1節）：「即使非優先使用，使用其他由國家標準認可的符號-特殊形狀符號，不應被認為和這個標準有衝突。