A "pTLD" stands for pseudo Top-Level Domains. According to the definition I found in Wikipedia, these include .bitnet, .csnet, .exit, .i2p, .local, .onion, .oz, .freene and .uucp and have no meaning in the global Domain Name System.
This blog is about new generic Top-Level Domains from the ICANN new gTLD program. Check our "News" section or subscribe to our weekly Newsletter: we're about new gTLDs and dotBrands (.BRANDs) "only".