>regret not doing an electrical engineering elective at uni when I had the chance. This notation would not liklely be in the curriculum. Mainly an artifact of

>regret not doing an electrical engineering elective at uni when I had the chance. This notation would not liklely be in the curriculum. Mainly an artifact of the pen-plotters that were used to print the early digital schematic drawings. Greek letters were not in the character set and at the same time they didn't always print a decimal point very legibly, so the R (multiplier=1, or other multiplier like K for kilohm) was used in lieu of an ohm symbol and it was inserted in the specified component label in place of the decimal point. Simple example amplifier: https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse4.mm.bing.net%2Fth%3Fid%3DOIP.7OWeucHDUrD76iTxgpakZAHaHG%26pid%3DApi&f=1&ipt=869408de3539abc6ad53533d766865f94cb59d02510ab687a2933b2424af700c&ipo=images https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2F... The lower case u substitutes for the Greek micron. So 7500 ohms would be drawn simply as 7k5.