Dictionary.net

• The reduplicated form of the abbreviation "L." for "law," used as a plural. It is generally used in citing old collections of statute law; as "LL. Hen. I."

1910 - Black's Law Dictionary (2nd edition)
By Henry Campbell Black

• WILL in I\'ll, he\'ll, that\'ll, &c.

1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry