PCS

*ˁlm - (to) sign (Kogan 2015:40, note 94)

Contra HALOT 834, there is hardly any connection with Hbr. ˁlm ‘to be hidden, concealed.’

Arabic
ˁlm - to know (Lane 2138)
Sabaic
ˁlm - to make acknowledgment (SD 15)
Also: tˁlm ‘to take notice, cognizance,’ ˁlm ‘sign, mark’ (SD 15)
Qatabanian
ˁlm - to sign (LIQ 119)
Geez
ˁallama - to write, to seal, to teach, to make a sign, to mark (CDG 61)
Kogan 2015:40, note 93: “Gez. ˁallama ‘to write, to seal, to teach, to make a sign, to mark’ (CDG 61) and related EthS forms are rightly considered Arabisms by Leslau.”