The alphabet was learned as a mnemonic using tree names. The acrostic of these items forms the mnemonic DOWN TIME. Writing systems were preceded by proto-writing, systems of ideographic and/or early mnemonic symbols. Writing systems were preceded by proto-writing, which used pictograms, ideograms and other mnemonic symbols. A 6502 assembly language statement consists of a three-character instruction mnemonic, followed by any operands. For example, a heavily rhythmic speech filled with mnemonic devices enhances memory and recall. Next comes the instruction mnemonic, then the parameters. "Dharanis" are often summaries of teachings that function like mnemonic aids. The first shape (=0) is denoted by the letter (a [[mnemonic]] being ""s"phere"). This suggests that the DKS model may have a correlate in mnemonic operations. He was a promoter of mnemonic systems and mind mapping techniques. Airway represents the "A" in the ABC mnemonic for trauma resuscitation. This can be easily remembered through the use of mnemonic devices. A common mnemonic for QNH is "Query&colon; Nautical Height". His assemblage of personal mnemonic images is riotous.