This is the 8470th most frequent Korean word.
ℓ
The symbol "ℓ" is not a Korean word; it represents "liter" in measurements.
Here, "ℓ" is used as an abbreviation for liter, a unit of volume commonly used to measure liquids.
그 가방에 물이 2ℓ 들어있어요.
That bag contains 2 liters of water.
In this sentence, "ℓ" denotes liter, indicating the capacity of the bottle.
콜라 한 병이 1ℓ 용량이에요.
A bottle of cola holds 1 liter.
The abbreviation "ℓ" is being used to specify the amount of milk in the pack, using liter as the measurement unit.