In games played for low, an unpaired low hand is referred to by its highest card, often its highest two cards and sometimes more if needed. So 8432A (in ace to five lowball) is "an eight" or "an eighty-four." (There's only one way to make an 84, so you'd never need to say an 843). If you showdown an 86 and another player shows down an 86, you might need to point out that you have an 863 while they have an 864.
Seven-card stud high-low with an 8 or better qualifier is sometimes referred to as 78. Old record albums are also sometimes referred to 78's, because that's how many revolutions per minute you have to play them at in order for them to sound right.
8 or Better
A common qualifier for low hands in high-low split games is that they must be unpaired with no card higher than an 8. Note that "8 or better" implies high-low split.