The Collaborative International Dictionary of English v.0.48:

Lif \Lif\ (l[i^]f), n. [Written also lief.]
   The fiber by which the petioles of the date palm are bound
   together, from which various kinds of cordage are made.
   [1913 Webster]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

LIF
       Low Insertion Force (IC)


The Free On-line Dictionary of Computing (30 December 2018):

LIF

   1.  Low Insertion Force.

   2.  Logical Interchange Format.

   (2003-10-15)