Hello, all.  I’m not a software engineer, and I've never been on this forum before. I wasn't at all sure about selecting a 'tag', and am not certain I chose an appropriate one. But, I have a thought that I'm hoping one of you might consider acting upon.  I design and build vacuum tube guitar amplifiers.  That means I must draw schematics of my designs.  There is software out there that designers use to create them on computers, and I've tried to use it, but can't understand how to do so, and there's just no one nearby to teach me.  So, I've taken to drawing them mostly by hand, scanning that drawing and then completing it using my Mac’s Emoji & Symbols menu.  Mostly, I use Preview to enter text onto the drawings.  But, lately, I’ve come to learn that I can actually create some basic electronics symbols, like that for a diode, or a resistor, by combining certain of those characters.  Trouble is, it can take 5 to 10 minutes to create the symbol for a resistor that way!   But, Apple has hidden potential here.  If the most common electronic symbols were added to the Emoji & Symbol drop down, one could draw most of a schematic in little time using Preview.  Even better would be the addition of  a special horizontal line to the library.  There’s already a few there, but most of them are difficult to use to make a long line in a drawing, as if typed in succession, there’s a gap between the lines.  And, if you try to make them linger by increasing the font size, they also get fatter!  But, I did find one that ,when typed in succession, does so without a break between the 2 lines, making a continuous horizontal line as long as one continues to enter that symbol.  If all the horizontal lines offered worked that way, one wouldn’t need to search for the one that does.  If a user needs a space between 2 of them, the space bar will suffice, eh? Also, if a vertical line were added to the library, wherein those lines could be connected by simply typing one, & then hit ‘enter’ before typing the next one, and doing so would cause them to connect as one continuous line, then the vertical circuit traces could be made in Preview, as well.   In other words, I could draw maybe 90 to 95 percent of my schematics in very little time using Preview.  And, the Emoji & Symbols menu, especially when used with Preview, has great potential that’s being wasted.  It could have many more uses, were it modified such that people can add new symbols to it.  A master file of symbols for all kinds of uses could be made available for selective additions to the Emoji & Symbols drop down on one’s Mac.  A library of them needs to be created, and a way to add them to the menu pointed out.  Thanks for listening!