登とう録ろく識しき別べつ子し

• 識しき別べつ子し

  A general identifier; 登録識別子 specifically refers to an identifier assigned during a registration process.

• 登とう録ろく番ばん号ごう

  Registration number, often used in official or administrative contexts; 登録識別子 is more common in computing and may include alphanumeric strings.

Compound of 登録 (registration) + 識別子 (identifier). The term is a direct technical translation of the English 'registration identifier'.