social/mail_activity/data/mail_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data noupdate="1">
        <record id="mail_activity_data_email" model="mail.activity.type">
            <field name="name">Email</field>
            <field name="icon">fa-envelope</field>
        </record>
        <record id="mail_activity_data_call" model="mail.activity.type">
            <field name="name">Call</field>
            <field name="icon">fa-phone</field>
            <field name="days">2</field>
        </record>
        <record id="mail_activity_data_meeting" model="mail.activity.type">
            <field name="name">Meeting</field>
            <field name="icon">fa-users</field>
        </record>
        <record id="mail_activity_data_todo" model="mail.activity.type">
            <field name="name">Todo</field>
            <field name="icon">fa-tasks</field>
            <field name="days">5</field>
        </record>
    </data>
</odoo>