The Collaborative International Dictionary of English v.0.48:

Symbolization \Sym`bol*i*za"tion\, n. [Cf. F. symbolisation.]
   The act of symbolizing; symbolical representation. --Sir T.
   Browne.
   [1913 Webster]

WordNet (r) 3.0 (2006):

symbolization
    n 1: the use of symbols to convey meaning [syn: symbolization,
         symbolisation]
    2: something visible that by association or convention
       represents something else that is invisible; "the eagle is a
       symbol of the United States" [syn: symbol, symbolization,
       symbolisation, symbolic representation]
    3: the practice of investing things with symbolic meaning [syn:
       symbolism, symbolization, symbolisation]