The principal of the trade badges in question was that the employments with the most demanding skills were A, and so forth down to D. From memory, it was not usual to progress up through the letters whilst doing one trade: a riveter's assistant [I made that up] would need to learn a new trade to get to a higher letter and more trade pay.
Another aspect is that these badges were used when there was not a recognised/ recognisable traditional emblem.
Lastly, as signalling was mentioned, not only did it have its unique badge, but [somewhat oddly] it was classified with the skill-at-arms badges and so worn on the left lower sleeve. There is always a "however".
However, a signalling instructor wore the flags above rank on right hand side.
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