'Inner square' definitions:

Definition of 'Inner square'

From: GCIDE

Inner \In"ner\ ([i^]n"n[~e]r), a. [AS. innera, a compar. fr. inne within, fr. in in. See In.]
1. Further in; interior; internal; not outward; as, an inner chamber. [1913 Webster]
2. Of or pertaining to the spirit or its phenomena. [1913 Webster]
This attracts the soul, Governs the inner man, the nobler part. --Milton. [1913 Webster]
3. Not obvious or easily discovered; obscure. [1913 Webster]
Inner house (Scot.), the first and second divisions of the court of Session at Edinburgh; also, the place of their sittings.
Inner jib (Naut.), a fore-and-aft sail set on a stay running from the fore-topmast head to the jib boom.
Inner plate (Arch.), the wall plate which lies nearest to the center of the roof, in a double-plated roof.
Inner post (Naut.), a piece brought on at the fore side of the main post, to support the transoms.
Inner square (Carp.), the angle formed by the inner edges of a carpenter's square. [1913 Webster]