Promotion label
Used promotions have a position in the cart, given the promotion's name. That name therefore normally should be something "understandable for the customer".
However when having a larger number of promotions, it can get quite confusion to work internally with all the promotions in a shop, having nothing but these "customer friendly names".
Solution: The "name" of promotions is their internal identifier. Above that every promotion gets a field for a public "label" which its position in the cart gets labeled when cashed in.
Example:
Shop has three different promotions named "10 % new customer promotion", "10 % newsletter voucher" and "10 % easter campaign" for unique identification internally.
When used, each of these promotions positions uses its "labals" instead of their "names", which could even be the same label in all three cases (for example simply "your 10 % discount")