These are different contructions of a single conductor for the same cross sectional area.
Single as in standard twin and earth
Multiwire as in the old 7/029 fixed cable
Fine as in between 7 and 21 wires in a fexible conductor not continuously being flexed
Very fine as 21 to as many as 100 or more wires per conductor in a very flexible cable such as the cables to lift carriages and moving machinerysuch as cranes.
The actual numbers quoted may not be accurate if there is a formal defination but the principle is correct
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