If you named all the SIDs after the place you depart from and all the STARs after the place you are going to, then all the EGLL inbound and outbound routes would be a 'Heathrow One something or other'.
In taxonomy, things are given names so that no doubt exists as to their identity.
The names chosen give an indication of the waypoint you eventually are flying TO.
The number is the revision or 'edition' of that route, and the letter identifies the start point of your route to the destination fix, whether it be a specific runway, (in the case of a SID), or a specific en-route waypoint, (as in a STAR).
Historically the SIDs extended further from the destination. EGCC had SIDs which terminated in 4 different 'countries'. The Mid !990s saw significant changes in SID/STAR nomenclature, driven by ICAO.
Last edited by ZOOKER; 16th April 2009 at 13:16.