Romanization of Telugu

There are several systems for romanization of the Telugu script.
UN romanization for geographical names.
The United Nations romanization systems for geographical names (approved 1972, I1/11; amended in 1977 IH/12) was based on a report prepared by D. N. Sharma.
The UN romanization uses macrons for long vowels ā ī ū, a dot under ṛ for vocalic r, and caron on ĕ and ŏ. 
ISO.
There are differences between the UN system and the ISO transliteration standard ISO 15919: 2001
ITRANS.
ITRANS also has transliteration for Telugu.
RTS.
Used in Vemuri Rao's "English-Telugu Dictionary" (2002) Rice University's Reverse Transliteration System (RTS) (created by Ramarao Kanneganti and Ananda Kishore) can be used for the transliteration of Telugu into Roman script as an alternative to phonetic alphabet. The RTS is defined below. (1) Represent short vowels by the lower case ..."
The result is a phonetic representation mostly suitable for dictionaries and computer input methods. Examples: 