icon("calendar")            # standard icon
icon("calendar", "fa-3x")   # 3x normal size
# add an icon to a submit button
submitButton("Update View", icon = icon("refresh"))
shinyUI(navbarPage("App Title",
  tabPanel("Plot", icon = icon("bar-chart-o")),
  tabPanel("Summary", icon = icon("list-alt")),
  tabPanel("Table", icon = icon("table"))
))Run the code above in your browser using DataLab