W.L.L. = With limited liability Company, shared (owned) by at least 2 people.

Est= Establishment, meaning a personal entity of SINGLE person or family (often inheritors).

In a W.L.L., your liability is restricted to the quantity of shares that you hold in the company, e.g. 25% share holder,
meaning that, a holder of 25% shares in the W.L.L. Company is entitled to the profit of 25% or loss of 25%. In case of loss, his liability is restricted to 25% and his personal assets remain safe (away from the loss).

In the case of Establishment, the single owner is liable for profit of up to 100% or loss up to 100%. In addition, his responsibility is not limited to 100%, rather, if the loss is more than 100%, his personal assets, like, house, shares, car etc. can become liable to settle the loss. Therefore his liability in an Establishment becomes unlimited (without any limit).