业界标准

• 業(work; career; undertaking)ASSOCIATIVE

A wooden rack for hanging musical instruments evolved to mean profession or work.

• 田(field; land)RADICAL
• 介(in the middle; separate)PHONETIC

A boundary is the dividing line between separate fields.

• 木(wood; timber)RADICAL
• 示(sign; mark)PHONETIC

A wooden sign (标) is made from wood to display directions for everyone.

• 冫(ice; cold)RADICAL
• 隹(short-tailed bird)PHONETIC

Cold ice water helps measure water level accurately, thus meaning standard, permissible.