O.G.

1.
officer of the guard.
2.
Architecture, ogee.
3.
Philately. See o.g (def 1).

o.g.

1.
Also, O.G. Philately. original gum: the gum on the back of a stamp when it is issued to the public.
2.
Architecture, ogee.

officer of the guard

noun, Military
1.
an officer, acting under the officer of the day, who is responsible for the instruction, discipline, and performance of duty of the guard in a post, camp, or station.
Abbreviation: OG, O.G.

ogee

[oh-jee, oh-jee] /oʊˈdʒi, ˈoʊ dʒi/
noun
1.
a double curve, resembling the letter S, formed by the union of a concave and a convex line.
2.
Also called gula. Architecture. a molding with such a curve for a profile; cyma.
Abbreviation: O.G., o.g.
Origin
1275-1325; Middle English ogeus, oggez (plural), variant (by assimilation of f) of oggifs, presumed singular oggif diagonal rib of a vault < Anglo-French, Old French ogive ogive
British Dictionary definitions for o.g

officer of the guard

noun
1.
a junior officer whose duty is to command a ceremonial guard OG

o.g.

abbreviation
1.
own goal

ogee

/ˈəʊdʒiː/
noun (architect)
1.
Also called talon. a moulding having a cross section in the form of a letter S
2.
short for ogee arch
Word Origin
C15: probably variant of ogive
Word Origin and History for o.g

ogee

n.

"S-shaped molding," 1670s, from French ogive "diagonal rib of a vault," earlier augive, of unknown origin. Related: ogival.