It shows whoever uses the term has no formal training or education in electrical. 110/220 was antiquated 50 60 years ago. 110 Volts was never an AC voltage to start with. 110 volts came from Edison DC system and most notably Edison 110 volt light bulb. In the last 50 years or so is 250/125 volts with +/- 10% tolerance. So as Engineers and Sparkies go we know when we hear someone say 220/110 volt, or I need a station ground, have no clue what they are talking about or doing.