The process of coating a paicle, such as a microbe, to target it for phagocytosis is called:

Leukocytes express receptors for proteins that coat microbes. The process of coating a paicle, such as a microbe, to target it for ingestion (phagocytosis) is called opsonisation. Substances that do this are opsonins. Ref: Robbins 8th edition Chapter 2.