Similar to h, hr

o.u. - oculus uterque - both eyes
od - oculus dexter - right eye
od - omne in die - every day/once daily preferred to qd in the UK[3]
om - omne mane - every morning
on - omne nocte - every night
o_2 - both eyes, sometimes written as o2
p.c. - post cibum - after meals

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