Any unknown abbreviations in the section "Apparatus" are most likely manuscript sigla. You can find these under Photographs.
LSJ -- Liddell-Scott-Jones, a Greek dictionary, see Dictionaries
Om. -- omitted
Op. cit. -- the work quoted above
Siggel -- this is an Arabic dictionary, see Dictionaries
Sigla -- manuscripts or early modern printings are indicated by letters of the alphabet to facilitate the work (e.g. "A has a corrupt reading" means that a specific early printed edition contains an error). These are called sigla.
S.v. -- under the heading
V.l. -- variant reading
Wehr -- an Arabic dictionary, see Dictionaries