Noun
enc (plural encs)
Abbreviation of enclosure. (indicating that a letter is accompanied by further material)
Various forms of prepaid electronic toll collection systems are in place which allow quicker collection of toll, usually at a discounted rate, as well as use of dedicated toll plaza lanes (for ENC system of the electronic toll collection). Source: Internet
If you are using an ENC and it specifies an environment for that node, it will override whatever is in the config file. Source: Internet