T=Tourist – Itineraries on footpaths, mule tracks or wide paths. Don't present orienteering problems.
E=Excursion route without technical difficulty – Itineraries on footpaths or trails on different ground types (grassy meadows, rocky ground). Orienteering capacity and good training to walk some hours are required.
EE=Trekking routes for expert hikers – Sign-posted itineraries with some difficulties: slippery, grassy or rocky ground, rocky or snowy slope or easy climbing passage (use of hands necessary). Only for experienced mountain hikers with at secure step, a good feeling for balance. Physical training for 1-day walk required.
EEA=Trekking routes for expert hikers with equipment – Equipped tracks or "vie ferrate". Technical equipment required.
Parents refers to a larger category under which an object falls. For example, theAconcagua mountain page has the 'Aconcagua Group' and the 'Seven Summits' asparents and is a parent itself to many routes, photos, and Trip Reports.