acrophonic

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Relating to an alphabet in which the names of the letters are represented by a word beginning with that letter or with the sound that letter represents, as when bravo, charlie represent the letters b, c.
• adjective Relating to an alphabet in which the letters derive from pictographs that represent a word beginning with the sound that the letter represents, such as the early alphabet of Canaanites from which the Greek, Roman, and Hebrew alphabets descend.

from The Century Dictionary.

• Same as acrophonetic.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Conforming to acrophony.