This Indus sign resembles a leaf from archaic variants of the Chinese word mén 門, which Xu Shen said was comprised of two hù 戶¹. It is a door or gate leaf.
In the context of the example from Lothal below, the symbol is an ideograph for the verb to open.
Illustrative Text Reference:
Lothal: Seal: L-86 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 258: Collections in India: Suomalainen Tiedeakatemia.
Comment:
There is only one extant example of this Indus sign.
It is interesting to note that Champollion states that a pictograph of a door leaf was used as an ideograph for the verb to open². Although, the Egyptian symbol for a door leaf differs from the Indus symbol, this is an example of common usage for the equivalent character in the two scripts.
Image Credit:
Door Leaf: Lynn Fawcett, 2017.
Notes:
1. Xu Shen, 121: Shuowen Jiezi (Explaining and Analysing Characters).
2. Jean-François Champollion le jeune, 1841: Dictionnaire égyptien en écriture hiéroglyphique: Chapter 5: Edifices en Construction: Paragraph 260: Manuscript Page 251: Firmin Didot, Paris.