A torrent tracker is a piece of software which tracks Torrents. It will record the number of leechers, number of seeders, how large the torrent is, what files are contained in the torrent, and how many times the torrent has been downloaded. You can think of it like a statistics tracker for torrents.
The unit of the Maya writing system is the glyphic cartouche, which is equivalent to the words and sentences of a modern language. Maya cartouches included at least three or four glyphs and as many as fifty. Each cartouche contained various glyphs, as well as prefixes and suffixes. There is no Maya alphabet.
The Maya writing system, often called hieroglyphs from a superficial resemblance to the Ancient Egypt writing system. It is the only writing system of the Pre-Columbian New World which is known to represent the spoken language of its community.