勅
チョク, いまし.める, みことのり, て, のり
imperial order
JLPT1 G7 S9 F2157
The relevant bronzeware inscription form is 柬 here an abbreviated form of 諫 admonish + 攵# (strike) → admonish by striking. A seal inscription form is 敕 as described in 整 (pull tightly on a bundle in straightening it) → admonish → *imperial edict* (issued to keep retainers/subjects in line; compare 詔). 勅 is a variant of 敕 that has relegated 敕 to variant form status.
[Full Kanji Etymology List]