Triglycerides and cholesterol are both fatty substances known as lipids. But, triglycerides are fats; cholesterol is not. Cholesterol is a waxy, odorless substance made by the liver that is an essential part of cell walls and nerves.
GSM (Global System for Mobile communication) is a digital mobile telephony system that is widely used in Europe and other parts of the world. GSM uses a variation of time division multiple access (TDMA) and is the most widely used of the three digital wireless telephony technologies (TDMA, GSM, and CDMA).
The term roaming originates from the GSM (Global System for Mobile Communications) standard used by mobile phones, which is the de facto global standard for mobile communications with over 80% market share. The term roaming can also be applied to the CDMA technology, (a channel access method that includes 3G, etc.).