I found an online version of the Texas Penal Code
http://tlo2.tlc.state.tx.us/statutes/pe.toc.htmIn it "Illegal Knife is defined
, (6) "Illegal knife" means a:
(A) knife with a blade over five and one-half inches;
(B) hand instrument designed to cut or stab another by being thrown;
(C) dagger, including but not limited to a dirk, stiletto, and poniard;
(D) bowie knife;
(E) sword; or
(F) spear.