According to Neil it's pronounced, "sector-field." I have no idea why he uses the printer's section mark. But he's quite insistent about it.
The annoying part for me is that the mark is not included in the lettering font I use. I have to switch to a different font which includes the mark, and type "Alt-0167" to make the mark show up, then tweak the kerning to position it properly. What a pain in the ass. Grumble-grumble.