A bit o’ knowledge, from advertisers Upfront.
The mast tube is nominally (not physically!) split into “Panels”, numbered from the deck upwards. Between the deck and the first set of spreaders is “Panel 1”, and between the first and second sets of spreaders is “Panel 2” etc. Spreaders are also numbered from deck upwards – Spreader 1, Spreader 2 and can be further split between port and starboard e.g. Spr1 Stbd.
The standing rigging is the fixed / structural stays which support the mast. These are often split into Fore & aft (forestay and backstay) and then the lateral rigging (side shrouds). In wire rigging world, people often refer to the Cap shroud (running all the way from deck to masthead) and intermediate stays, however when we start talking rod and composite rigging we need to be more explicit and break the lateral rigging elements down in more detail. Read on.