Joint Military Symbology is the NATO standard for military map marking symbols. Code 128 is a high-density linear barcode symbology defined in ISO/IEC 15417&colon;2007. The sphinx imagery has historically been adopted into Masonic architecture and symbology. The mapping between messages and barcodes is called a "symbology". As professor at Harvard University, he teaches religious iconology and the fictional field of symbology. It is an alphanumeric, variable length symbology. The PDF417 symbology was invented by Ynjiun P. Wang at Symbol Technologies in 1991. The meditation is aided by extensive symbology, mantras, diagrams, models (deity and mandala). The LTO cartridge label in library applications commonly uses the bar code symbology of USS-39. The CRT package is more capable, but remains limited to monochrome presentation of cursive symbology. Stacked symbologies repeat a given linear symbology vertically. Hellenistic symbology and elements in coinage largely disappeared. It dealt in and preserved Klan artifacts and symbology. In NATO military symbology, blue typically denotes friendly forces. Current bag tags include a bar code using the Interleaved 2 of 5 symbology.