In CDMA, GSM technology we use antenna system to transmit and receive signals from mobile and from BTS. One of the characteristic of antenna is antenna gain. dBi and dBd is a unit to measure antenna gain with respect to isotropic antenna and dipole antenna respectively.
Dipole has 2.15 dB gain compared to an isotropic antenna, hence
dBi = 2.15 dB + dBd
For example an omni antenna has antenna gain 12.15 dBi or 10 dBd
Here are some interactive sites that you can use to teach about plants, the life cycle, and photosynthesis: technology journal
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