Initialism: sealed lead-acid battery.

• A rechargeable lead battery in a sealed case.

Initialism: second language acquisition.

• The process of learning a non-native language.

Initialism: service level agreement.

• A contract defining service performance metrics.

Initialism: specific leaf area.

• Leaf area per unit dry mass in plant science.

Initialism: stereolithography apparatus.

• Early term for a resin 3D printer.

Initialism: Sudan Liberation Army.

• An armed group involved in the Darfur conflict.

Initialism: Symbionese Liberation Army.

• A US radical group active in the 1970s.