What does i, g and c in oracle 8i, 9i, 10g, 11g and 12c stand for?

The i in oracle 8i and 9i stands for INTERNET and the g in 10g and 11g stands for GRID because from 10g onwards oracle supports grid architecture.

A relational database management system (DBMS) from Oracle, which runs on more than 80 platforms. Introduced in the late 1970s, Oracle was the first database product to run on a variety of platforms from micro to mainframe. The Oracle database is Oracle's flagship product, and version 11g was introduced in 2007.

Oracle 11g features include built-in testing for changes, the capability of viewing tables back in time, superior compression of all types of data and enhanced disaster recovery functions.11g is Oracle's grid computing product group including (among other things) a database management system (DBMS) and an application server. In addition to supporting grid computing features such as resource sharing and automatic load balancing, 10g products automate many database management tasks. The Real Application Cluster (RAC) component makes it possible to install a database over multiple servers.

Designed to manage data center and cloud environments, Oracle Enterprise Manager has consistently focused on business-driven IT management. The latest release, Oracle Enterprise Manager 12c, continues this focus and expands its cloud management capabilities to deliver a complete solution for setting up, managing, provisioning, and charging back for Oracle technology–based enterprise clouds.

In short,i stands for INTERNETg stands for GIRD Computingc stands for CLOUD